10mm WPA Dynavap Glass marble Stem- Secret White/ Red Blue Green

10mm WPA Dynavap Stem. Stem comes with 2 additional o-rings (6x1.1mm) that are 0.1mm larger then the stock oring to ensure a secure fit. 

*Some tips work best with one 6x1.1mm o-ring in the uppermost o-ring position that inserts inside the stem.